Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add rules/team-plain/cursor-plugin-mcp/plaingit clone --depth 1 https://github.com/team-plain/cursor-plugin-mcpWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00720 | $0.00720 |
| Opus 5 | $0.00360 | $0.00360 |
| Sonnet 5 | $0.00144 | $0.00144 |
| Haiku 4.5 | $0.00072 | $0.00072 |
Grade A, and why
plain scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 64 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Plain MCP
You have access to the Plain MCP server which connects to the user's Plain workspace. Use these tools to help with customer support workflows.
Available tools
Threads
- getThreads / getThreadDetails / searchThreads: Query and search support threads.
- replyToThread: Send a reply to a customer thread.
- addGeneratedReply: Add an AI-generated draft reply for review.
- assignThread / unassignThread: Assign or unassign threads to team members.
- markThreadAsDone / markThreadAsTodo: Change thread status.
- snoozeThread: Snooze a thread until a specified time.
- changeThreadPriority: Adjust thread priority.
- addLabels / removeLabels: Manage thread labels.
- createNote: Add an internal note to a thread.
Customers
- getCustomers / getCustomerDetails / searchCustomers: Look up customer information.
- getCustomerThreads: Get all threads for a specific customer.
- upsertCustomer: Create or update a customer record.
Tenants
- getTenants / getTenantDetails / searchTenants: Query tenant (company) information.
- upsertTenant: Create or update a tenant.
- upsertTenantField: Set custom fields on a tenant.
Thread fields
- getThreadFieldSchemas: List available thread field schemas.
- createThreadFieldSchema / updateThreadFieldSchema / deleteThreadFieldSchema: Manage thread field schemas.
- upsertThreadField / bulkUpsertThreadFields: Set custom field values on threads.
- reorderThreadFieldSchemas: Change the display order of thread fields.
Labels
- getLabels: List all label types.
- createLabelType / updateLabelType: Manage label types.
- archiveLabelType / unarchiveLabelType: Archive or restore label types.
- moveLabelType: Reorder a label type.
Help center
- getHelpCenters / getHelpCenterArticles / getHelpCenterArticle: Browse help center content.
- getHelpCenterArticleBySlug: Look up an article by its URL slug.
- getHelpCenterArticleGroups: Get article groupings.
- upsertHelpCenterArticle: Create or update a help center article.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- yesterday First seen · 64 lines · 720 tokens per session scan A 884bf7a4e158
plain is a cursor rule published in the GitHub repository team-plain/cursor-plugin-mcp (2 stars, last pushed 5mo ago), licensed MIT. It adds 720 tokens to every session, about $0.0036 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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